SMLJ43E3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ43E3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, classified as a Zener-type device in the DO-214AB surface mount package. This component is designed for general-purpose transient voltage protection applications, offering a 43V reverse standoff voltage with 76.7V maximum clamping voltage and 39.2A peak pulse current capability at 300W peak pulse power dissipation.

The SMLJ43E3/TR13 maintains Active product status. Substitute components are identified based on equivalent electrical ratings and mechanical compatibility, enabling design flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	43	V
Voltage - Breakdown (Min)	47.8	V
Voltage - Clamping (Max) @ Ipp	76.7	V
Current - Peak Pulse (10/1000µs)	39.2	A
Power - Peak Pulse	300	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AB, SMC	—
Type	Zener, Unidirectional	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ43E3/TR13 are qualified based on the following critical parameters:

Voltage Rating Match: All substitutes maintain identical Voltage - Reverse Standoff (43V), Voltage - Breakdown (Min 47.8V), and Voltage - Clamping specifications within allowable tolerance ranges
Package Compatibility: All alternatives use DO-214AB or SMC surface mount packaging, ensuring mechanical and electrical compatibility
Device Type: All substitutes are unidirectional Zener-type TVS diodes
Functional Application: General-purpose or equivalent application classification
Compliance Standards: RoHS3 compliance is required; REACH status must be unaffected or affected (indicating no additional restrictions beyond RoHS)

Substitutes are grouped by power dissipation capability (300W, 1.5kW, 3kW, and 5kW), reflecting different peak pulse current handling performance while maintaining the same voltage protection specifications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Clamping @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Packaging	Inventory
SMLJ43E3/TR13	Microchip Technology	76.7	39.2	300	-55 to 150	Tape & Reel	982 Pcs
SMCJ43A-13-F	Diodes Incorporated	69.4	21.6	1500	-55 to 150	Tape & Reel	2066 Pcs
SMCJ43A-TP	Micro Commercial Co	69.4	21.7	1500	-55 to 175	Tape & Reel	3413 Pcs
SMCJ43A	MDD	69.4	21.7	1500	-50 to 150	Surface Mount	1330 Pcs
5.0SMDJ43A-T7	Littelfuse Inc.	69.4	72.1	5000	-65 to 150	Tape & Reel	1443 Pcs
5.0SMDJ43A	Taiwan Semiconductor Corporation	69.4	72.1	5000	-55 to 175	Tape & Reel	9100 Pcs
SMDJ43A	Alpha & Omega Semiconductor Inc.	69.4	43.3	3000	-55 to 150	Tape & Reel	1305 Pcs
SMLJ43A	Bourns Inc.	69.4	43.2	3000	-55 to 150	Tape & Reel	13032 Pcs

Engineering Selection Recommendations

Primary Consideration: All qualified substitutes maintain the required 43V reverse standoff voltage and 47.8V minimum breakdown voltage, ensuring functional equivalence in transient protection circuits. Selection between alternatives depends on power dissipation requirements and operating temperature range specifications for the target application.

RoHS3 Compliance: The SMLJ43E3/TR13 is RoHS3 compliant. All listed substitutes maintain RoHS3 compliance, meeting the same environmental and regulatory standards.

Moisture Sensitivity: The SMLJ43E3/TR13 specifies MSL 1 (Unlimited). Substitutes with published MSL ratings also specify MSL 1, indicating equivalent handling and storage requirements. Substitutes without published MSL data present no additional moisture sensitivity constraints beyond standard SMC surface mount handling practices.

Temperature Range: Design requirements exceeding the -55°C to 150°C range of the primary part are accommodated by SMCJ43A-TP (upper limit 175°C) and 5.0SMDJ43A (upper limit 175°C), or by 5.0SMDJ43A-T7 (lower limit -65°C).

Clamping Voltage Variation: Substitutes rated at 69.4V clamping versus the original 76.7V represent a lower peak voltage excursion, generally beneficial in protection applications. Applications with strict voltage margin requirements should verify compatibility with the reduced clamping specification.

REACH Status: The SMLJ43E3/TR13 has REACH Unaffected status. Substitute SMLJ43A (Bourns) shows REACH Affected status, indicating review of SVHC (Substances of Very High Concern) declarations is required for restricted material applications. All other substitutes maintain REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: What electrical parameters must match for a valid substitute? A: The 43V reverse standoff voltage, 47.8V minimum breakdown voltage, and unidirectional Zener diode type are the primary matching criteria. Clamping voltage, peak pulse current, and power dissipation may vary based on application requirements, as long as the substitute meets or exceeds protection performance needs.

Q: Can I use a substitute with different clamping voltage specifications? A: Yes. All listed substitutes specify 69.4V clamping voltage versus the original 76.7V. This represents a lower peak voltage transient, which is typically acceptable in protection circuits. However, applications requiring specific voltage margins should confirm compatibility with circuit design parameters.

Q: Are there thermal management differences between substitutes? A: Yes. The 5kW-rated substitutes (5.0SMDJ43A-T7 and 5.0SMDJ43A) dissipate significantly higher power levels than the original 300W rating. Lower power-rated substitutes (1.5kW) require verification that circuit transient conditions do not exceed their dissipation limits. Higher power ratings provide design margin but do not increase protection voltage levels.

Q: Which substitute offers the best inventory availability? A: SMLJ43A from Bourns Inc. offers the highest inventory at 13,032 pieces. 5.0SMDJ43A from Taiwan Semiconductor Corporation provides 9,100 pieces and qualifies for an extended upper operating temperature of 175°C.

Q: Do substitutes require design validation or PCB layout changes? A: All substitutes maintain DO-214AB or SMC surface mount packaging and pinouts. Footprint compatibility is ensured. Circuit validation should address any differences in peak pulse current capability or clamping voltage if these parameters are critical to circuit performance.

Q: Are there supply chain or lead time considerations for these substitutes? A: All listed parts show Active product status with current inventory. Selection between manufacturers may be driven by supply chain logistics, qualification procedures, or existing vendor relationships. No substitutes show end-of-life or obsolescence status.

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